Progress is reported on four research tasks. An experiment tested the effectiveness of a computer-based phonology instructional system for second-language learning. In research on models of human-computer interactions, experiments were performed demonstrating that the provision of certain incentives to the users of a time-sharing system can have the effect of shaping patterns of user-choice behavior which improve the overall efficiency of the system. The investigation of programing languages as a tool for cognitive research has led to the development and construction of a wireless computer-controlled vehicle to aid students in conceptualizing previously abstract processes in problem solving. In addition, an experiment was conducted in teaching the programing language LOGO to a group of heard-to-teach students. The validity of standard measurements of achievement level was also investigated. Studies of human memory and language processing elucidated the cognitive operations involved in the storage, retrieval, and utilization of factual material. (Author/JY)